"Pennsylvania, County Marriages, 1885-1950," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VF9R-V6K : 5 August 2020), Frank G. Cox and May Billig, 18 Sep 1907; citing Marriage, Mercer, Pennsylvania, United States, multiple County Clerks, Pennsylvania.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFB2-G57 : accessed 27 August 2020), Maye Cox in household of Frank G Cox, Elgin, Erie, Pennsylvania, United States; citing ED 62, sheet 6A, line 20, family 138, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1565; FHL microfilm 1,821,565.
Find a Grave, database and images (https://www.findagrave.com : accessed 27 August 2020), memorial page for Mattie Mae Billig Cox (18 Oct 1891–14 Feb 1979), Find a Grave Memorial no. 60080242, citing Lovettsville Union Cemetery, Lovettsville, Loudoun County, Virginia, USA ; Maintained by Betty Frain (contributor 46858568) . Find A Grave: Memorial #60080242
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